Compact duct system incorporating moveable and nestable baffles for use in tools used to process microelectronic workpieces with one or more treatment fluids

ABSTRACT

Apparatuses, and related methods, for processing a workpiece that include particular baffle members or duct structures having an inlet proximal to an outer periphery of a workpiece and/or workpiece support.

PRIORITY CLAIM

The present nonprovisional patent Application claims priority under 35USC §119(e) from U.S. Provisional Patent Application having Ser. No.60/667,369, filed on Apr. 1, 2005, by Rose et al. and titled COMPACTDUCT SYSTEM INCORPORATING MOVEABLE AND NESTABLE BAFFLES FOR USE IN TOOLSUSED TO PROCESS MICROELECTRONIC WORKPIECES WITH ONE OR MORE TREATMENTFLUIDS and Ser. No. 60/667,263, filed on Apr. 1, 2005, by Collins et al.and titled COMPACT DUCT SYSTEM INCORPORATING MOVEABLE AND NESTABLEBAFFLES FOR USE IN TOOLS USED TO PROCESS MICROELECTRONIC WORKPIECES WITHONE OR MORE TREATMENT FLUIDS, wherein the respective entireties of saidprovisional patent applications are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to tools that are used to processmicroelectronic substrates with one or more treatment fluids, includingliquids and gases. More particularly, the present invention relates tosuch tools that include movable and nestable baffle members that thatcan be positioned to open and close, and help define the boundaries of,one or more ducts for collecting and recovering the treatment fluidsthat are used.

BACKGROUND OF THE INVENTION

The microelectronic industry relies on a variety of different processesto manufacture microelectronic devices. Many processes involve asequence of treatments in which different kinds of treatments fluids arecaused to contact the workpiece in accordance with desired recipes.These fluids may be liquids, gases, or combinations thereof. In sometreatments, solids may be suspended or dissolved in a liquid orentrained in a gas. It is highly desirable to capture and recover thesetreatment fluids for a variety of reasons including proper disposal,recycling, fume containment, process monitoring, process control, orother handling.

One capture technique involves using appropriately positioned ducts tocapture treatment fluids. For instance, a typical manufacturing tool inthe microelectronics industry involves supporting one or more workpiecesin a processing chamber on a suitable support, such as a stationaryplaten, rotating turntable, or rotatable chuck. One or more ducts arepositioned at least partially around the outer periphery of the support.As a treatment fluid is introduced into the processing chamber, anexhaust can be used to help pull the treatment fluid into the one ormore ducts. With respect to rotating supports, centrifugal force causesfluids on a spinning workpiece and/or support surface to flow radiallyoutward from the spin axis and into the duct(s).

Conventionally, a tool may include a single duct to capture differenttreatment fluids. However, using a single duct like this is notdesirable in all instances. For example, some treatment fluids may betoo reactive in the presence of other treatment materials. Other times,it may be desirable to capture different fluids using different captureconditions. Still other times, such as when recycling is desired, it maybe desirable to capture a fluid in a dedicated duct to avoidcontamination with other fluids.

Accordingly, tools containing multiple, stacked ducts, fixed relative toeach other, have been used. Either the workpiece support and/or thestacked ducts themselves are raised and lowered in order to bring theappropriate duct into position. This conventional approach suffers fromserious drawbacks. The stacked ducts make high-density tool packagingmore difficult. The different ducts may also be subject tocross-contamination because they are always open to the workpiece and/orexhaust levels are not individually controlled. Some conventional ductsystems also may not have the capability to separate the liquid and gasconstituents of an exhaust stream. In some tools in which the ductstructures themselves are moveable, drain and exhaust connections toexternal plumbing must also move, thereby adding undue complexity totool design, manufacture, use, and service.

There is a continuing need, therefore, in the microelectronics industryto provide compact tools that nonetheless incorporate multiple ducts forcapturing different kinds of treatment fluids.

SUMMARY OF THE INVENTION

The present invention provides a novel duct system for use in tools inwhich microelectronic workpieces are treated with treatment fluids,including liquids, gases, fluidized solids, dispersions, combinations ofthese and the like. The ducts are used to capture the various treatmentfluids for recycling, discarding, or other handling. Different treatmentfluids can be recovered in different, independent ducts to minimizecross-contamination and/or to use unique capture protocols for differentfluids.

The duct system of the present invention is extremely compact. The ductsystem is defined at least in part by moveable and nestable ductstructures in which portions of duct pathways may exist between thesestructures and/or between these and other structures in the tool. Forexample, when the structures are moved apart relatively, a duct pathwayopens and is enlarged between the structures. When the structures aremoved together relatively, the duct between the structures is choked andis reduced in size. In preferred embodiments, multiple ducts can existin the same volume of space depending upon how the moveable ductstructures are positioned. Thus, multiple ducts can occupy a volumeminimally larger than the volume occupied by only a single duct.

The moveable duct structures are preferably fluidly coupled to fixedduct structures so that drain and exhaust connections between the tooland external plumbing are fixed and need not move.

In one aspect, the present invention relates to an apparatus forprocessing a microelectronic workpiece. The apparatus includes a supporton which the workpiece is positioned during a process. The apparatusalso includes a plurality of moveable and nestable baffle membersdefining at least portions of a plurality of duct pathways havingrespective duct inlets proximal to an outer periphery of the workpiece.

In another aspect, the present invention relates to an apparatus forprocessing a microelectronics workpiece. The apparatus includes arotatable support on which the workpiece is positioned during a process.The apparatus also includes a plurality of moveable baffle membersdefining at least a first duct pathway between the baffle members andhaving an inlet proximal to an outer periphery of the rotatableworkpiece. Displacement of the baffle members relative to each otheropens and chokes at least the first duct pathway.

In another aspect, the present invention relates to an apparatus forprocessing a microelectronic workpiece. The apparatus includes a housingand a rotatable support positioned in the housing and onto which theworkpiece is positioned for processing. The apparatus includes aplurality of duct pathways having respective inlets proximal to an outerperiphery of the rotatable workpiece. Each duct pathway is defined atleast in part by structures comprising a plurality of fixed ductstructures that are relatively distal from the rotatable workpiece and aplurality of independently moveable baffle members that are relativelyproximal to the rotatable workpiece and that define duct pathwayportions that are fluidly coupled to respective fixed duct structures.

In another aspect, the present invention relates to an apparatus forprocessing a microelectronic workpiece. The apparatus includes aprocessing chamber in which the workpiece is positioned during aprocess. A barrier structure overlies and covers the workpiece in amanner effective to help provide a tapering flow channel proximal to amajor surface of the workpiece.

In another aspect, the present invention relates to a method ofprocessing a microelectronic workpiece. The workpiece is positioned in aprocessing chamber. A barrier structure overlies and covers theworkpiece in a manner effective to help provide a tapering flow channelproximal to a major surface of the workpiece that tapers in a radiallyoutward direction relative to said surface. While the workpiece ispositioned in the processing chamber and covered by the barrierstructure, at least one processing material is caused to flowinglycontact said major surface of the workpiece.

In another aspect, the present invention relates to an apparatus,comprising a processing chamber in which the workpiece is positionedduring a process. A barrier structure overlies and covers the workpiecein a manner effective to help provide a tapering flow channel proximalto a major surface of the workpiece that tapers in a radially outwarddirection relative to said surface. The barrier structure iscontrollably moveable through a range of motion including a firstposition in which the processing chamber is sufficiently open to allowworkpiece transfer to and from the processing chamber and a secondposition in which the barrier structure helps to guide at least onematerial flowing over said major surface.

In another aspect, the present invention relates to a nozzle devicecomprising an annular body having a lower surface that is angled so asto help define a tapering flow channel over a workpiece surface when thebody is positioned over the workpiece surface. At least one nozzle isintegrated with the annular body in a manner effective to dispense oneor more processing materials downward onto the workpiece surface. Theannular body includes one or more processing material supply conduitsthrough which one or more processing materials are supplied to the atleast one nozzle.

In another aspect, the present invention relates to a nozzle devicecomprising an annular body having a lower surface that is angled so asto help define a tapering flow channel over a workpiece surface when theannular body is positioned over the workpiece surface. The annular bodycomprises an inner periphery defining a central pathway that providesegress between a volume above the annular body and a volume below theannular body. An arm structure is coupled to the annular body andextends generally across the central pathway in a manner effective tohelp define first and second pathway portions. At least a first,independent array of nozzles is integrated with the annular body in amanner such that the first array extends at least partially along thearm structure and a first radius of the annular body in a mannereffective to dispense one or more processing materials downward onto theworkpiece surface. At least one independent nozzle is integrated intothe central arm in a manner effective to dispense one or more processingmaterials downward onto a central portion of the workpiece. At least oneindependent nozzle is positioned to dispense one or more processingmaterials onto the workpiece from a flow path that extends through atleast one of the central flow pathway portions.

In another aspect, the present invention relates to a nozzle devicecomprising a first nozzle structure through which one or more processingmaterials independently are atomizingly dispensed onto a workpiecesurface across at least a portion of a radius of the workpiece surface;a second nozzle structure is provided through which one or moreprocessing materials independently are dispensed onto a central portionof the workpiece surface; and a third nozzle structure through which oneor more processing materials are independently introduced into aheadspace above the workpiece surface. The first, second and thirdnozzle structures are moveable relative to the workpiece surface.

In another aspect, the present invention relates to an apparatus forprocessing a microelectronic workpiece. The apparatus includes aprocessing chamber in which the workpiece is positioned during a processand a moveable member comprising a tube portion having a through bore.The moveable member is positioned over the workpiece and is moveablerelative to a major surface of the workpiece. At least one independentnozzle structure is physically coupled to the moveable member such thatmovement of the moveable member allows the relative spacing between themajor surface of the workpiece and the nozzle structure to becontrollably adjusted. At least a portion of at least one fluid supplypathway in the through bore of the tube portion is fluidly coupled tothe at least one independent nozzle structure and workpiece.

In another aspect, the present invention relates to an apparatus forprocessing a microelectronic workpiece. The apparatus includes aprocessing chamber in which the workpiece is positioned during a processand a ceiling structure overlying the processing chamber in a mannereffective to provide a first zone relatively distal from the processingchamber and a second zone relatively proximal to the processing chamber.The ceiling structure comprises a walled conduit providing egressbetween the first and second zones. A moveable member is housed in thewalled conduit. The member comprises at least a tube portion having afirst port to provide egress into the through bore from the first zone.The moveable member is moveable relative to the walled conduit and withrespect to the workpiece. A nozzle structure is coupled to the moveablemember in a manner such that the nozzle structure is positionable todispense one or more processing materials into the processing chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an isometric view of a preferred tool embodiment of thepresent invention.

FIG. 2 shows an isometric, cross-sectional view of a portion of the toolof FIG. 1 taken along line A-A in which the tool is in a configurationin which an inner duct pathway is open and the shutter islowered/closed.

FIG. 3 shows an isometric, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B in which the tool is in a configurationin which an inner duct pathway is open and the shutter is raised/open.

FIG. 4 shows an isometric, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B in which the tool is in a configurationin which a middle duct pathway is open.

FIG. 5 shows an isometric, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B in which the tool is in a configurationin which an outer duct pathway is open.

FIG. 6 shows an isometric cross-sectional view of the tool of FIG. 1taken along line A-A in which the tool is in a workpiece transferconfiguration.

FIG. 7 shows an isometric cross-sectional view of the tool of FIG. 1taken along line B-B in which the tool is in a workpiece transferconfiguration.

FIG. 8 is an isometric view of the bottom of the tool of FIG. 1.

FIG. 9 is an alternative isometric view of the bottom of the tool ofFIG. 1.

FIG. 10 is an isometric view of the base pan of the tool of FIG. 1 withcomponents removed to show a series of annular, concentric walls risingupward from the bottom of the base pan to define a plurality of exhaustplenums and drain basins.

FIG. 11 is an isometric view of the drip ring used in the tool of FIG.1.

FIG. 12 is an isometric view of the outer, annular baffle plate used inthe tool of FIG. 1 (The middle and inner baffle plates are not shown butare similar except for being sized to nest inside each other as shown inother Figures and described further herein).

FIG. 13 is an isometric view of the outer baffle hood used in the toolof FIG. 1 (The middle and inner baffle hoods are not shown but aresimilar except for being sized to nest inside each other as shown inother Figures and described further herein).

FIG. 14.A is a close-up, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B that generally identifies the area aroundthe annular drip ring.

FIG. 14.B is a close-up, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B that generally identifies the area aroundthe inner baffle member.

FIG. 14.C is a close-up, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B that generally identifies the area aroundthe middle baffle member.

FIG. 14.D is a close-up, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B that generally identifies the area aroundthe outer baffle member.

FIG. 14.E is a close-up, cross-sectional view of a portion of the toolof FIG. 1 taken along line B-B that generally identifies exhaust plenumsand drain basins.

FIG. 15 is another close-up, cross-sectional view of a portion of thetool of FIG. 1 taken along line B-B.

FIG. 16 is a cross-sectional view of a portion of the tool of FIG. 1taken along line B-B.

FIG. 17 shows an isometric, cross-sectional view of a portion of thetool of FIG. 1 taken along line A-A in which the tool is in aconfiguration in which the dispense assembly is lowered to carry out atreatment and the shutter is lowered/closed.

FIG. 18 shows an isometric view of the ceiling plate used in the tool ofFIG. 1.

FIG. 19 shows an isometric view of the moveable support member used inthe tool of FIG. 1.

FIG. 20 is a cross-sectional view of a portion of the tool of FIG. 1taken along line C-C of FIG. 8 showing actuator parts for the outer andinner baffle members.

FIG. 21 is an isometric view of the dispense assembly used in the toolof FIG. 1.

FIG. 22.A is a cross-sectional, isometric view of the dispense assemblyof FIG. 21 taken along line G-G.

FIG. 22.B is a cross-sectional, isometric view of the dispense assemblyof FIG. 21 taken along line G-G that is similar to FIG. 22. A except foridentifying additional reference characters.

FIG. 23 is an isometric view of the spray nozzle/barrier structure usedin the dispense assembly of FIG. 22 looking generally at the undersideof the structure.

FIG. 24 is an isometric view of the spray nozzle/barrier structure usedin the dispense assembly of FIG. 22 looking generally at the top side ofthe structure.

FIG. 25 is a cross-sectional view of the spray nozzle barrier structureof FIG. 24 taken along line H-H.

FIG. 26 is a cross-sectional view of the spray nozzle barrier structureof FIG. 24 taken along line J-J.

FIG. 27 is an isometric view of the central dispense nozzle member usedin the dispense assembly of FIG. 22.

FIG. 28 is an isometric view of the retainer/spacer clamp used in thedispense assembly of FIG. 22.

FIG. 29 is an isometric view of a portion of the dispense assembly ofFIG. 22 including the central dispense nozzle and retainer/spacer clampsubassembly.

FIG. 30 is a cross-sectional, isometric view of the subassembly of FIG.29 taken along line D-D.

FIG. 31 is a cross-sectional, isometric view of the subassembly of FIG.29 taken along line C-C.

FIG. 32 is an isometric view of the showerhead dispense assembly used inthe dispense assembly of FIG. 22, looking generally at the top side ofthe assembly.

FIG. 33 is an isometric view of the showerhead dispense assembly of FIG.22 looking generally at the bottom side of the assembly.

FIG. 34 is an isometric view of the base used in the showerhead dispenseassembly of FIG. 32.

FIG. 35 is an isometric view of the cover used in the showerheaddispense assembly of FIG. 32.

FIG. 36 is an isometric view of a mounting standoff used in the dispenseassembly of FIG. 22.

FIG. 37 is a cross-sectional view of a portion of the tool of FIG. 1taken along line A-A showing the nesting relationship among the moveablesupport member, the shutter, and the ceiling plate.

FIG. 38 is an isometric view of the shutter used in the tool of FIG. 1.

DETAILED DESCRIPTION OF PRESENTLY PREFERRED EMBODIMENTS

The embodiments of the present invention described below are notintended to be exhaustive or to limit the invention to the precise formsdisclosed in the following detailed description. Rather the embodimentsare chosen and described so that others skilled in the art mayappreciate and understand the principles and practices of the presentinvention. While the present invention will be described in the specificcontext of fluid based microelectronic substrate cleaning systems, theprinciples of the invention are applicable to other microelectronicprocessing systems as well.

FIGS. 1 through 38 show an illustrative tool 10 that incorporatesprinciples of the present invention. For purposes of illustration, tool10 is of the type in which a single workpiece 12 is housed in the tool10 at any one time and subjected to one or more treatments in whichliquid(s) and/or gas(es) are caused to contact the workpiece 12. In themicroelectronics industry, for instance, tool 10 may be referred to as asingle wafer processing tool. Workpiece 12 is typically a semiconductorwafer or other microelectronic substrate.

Tool 10 generally includes as main assemblies processing section 11 andbarrier dispense section 500. In actual use, the dispense section 500and processing section 11 would be mounted to a framework (not shown)and enclosed within a housing (not shown) of tool 10. This mounting canoccur in any manner such as via screws, bolts, rivets, adhesives, welds,clamps, brackets, combinations of these, or the like. Desirably, though,the sections 11 and 500 and/or components thereof are independent andremovably mounted to facilitate service, maintenance, upgrade, and/orreplacement.

Processing section 11 generally includes a base 14 formed at least inpart by base pan 16 and peripheral sidewall 18. Base pan 16 andsidewalls 18 may be formed from parts that are screwed, bolted, glued,welded, or otherwise attached to each other. Alternatively, base pan 16and sidewalls 18 may be integrally formed as one part as is shown.

In this particular preferred embodiment, three pairs of annular,generally concentric walls 22 and 23, 24 and 25, and 26 and 27 projectupward from base pan 16. These walls help to define exhaust plenums 29,30, and 31 and drain basins 52, 53, 54 and 55. The exhaust plenums 29,30, and 31 and the drain basins 52, 53, and 54 form portions of threeindependent, nested exhaust duct pathways 330, 338, and 346 to bediscussed further below. Of course, other representative embodiments ofthe invention may include a lesser or greater number of such ducts asdesired in which case a lesser or greater number of exhaust plenums anddrain basins would be provided, as appropriate.

Also in the embodiment of tool 10 as shown, the ducts 330, 338, and 346preferably are independent and discrete from each other in that eachsuch duct has its own exhaust plenum(s) and drain basin(s).Advantageously, this allows individual exhaust streams to be separatelyhandled at the exhaust and/or other stage(s) of processing. This may bedesirable for a variety of reasons. For instance, it may be desirable torecover liquid constituents of an exhaust stream for recycling. Use of adedicated exhaust duct for such liquid constituents avoidscross-contamination with other streams. In other instances, it may bedesirable to exhaust different streams under different conditions. Theuse of independent and discrete exhaust duct pathways thus is preferredin many instances. However, in other embodiments, especially where aneven more compact design is desired, two or more exhaust ducts may sharea drain basin and/or an exhaust plenum.

The top rims 33 and 34 of walls 22 and 23 define a generally annularexhaust inlet 35 by which an exhaust stream enters inner exhaust plenum29. The bottom of exhaust plenum 29 includes one or more exhaust outletports 48 through which an exhaust stream exits inner exhaust plenum 29.In similar fashion, the top rims 38 and 39 of walls 24 and 25 define anannular exhaust inlet 40 by which an exhaust stream enters middleexhaust plenum 30. The floor of plenum 30 includes one or more exhaustoutlet ports 49 through which an exhaust stream exits middle exhaustplenum 30. Also in similar fashion, the top rims 43 and 44 of walls 26and 27 define an annular exhaust inlet 45 by which an exhaust streamenters outer exhaust plenum 31. The floor of plenum 31 includes one ormore exhaust outlet ports 50 through which an exhaust stream exits outerexhaust plenum 31.

Each drain basin 52, 53, 54, and 55 respectively includes a floor 56,57, 58, and 59. Each of floors 56, 57, 58, and 59 respectively includesone or more drain outlets such as outlets 63 and 67 through whichcollected liquid exits the corresponding drain basin. The floor 56 ofinner drain basin 52 is appropriately sloped to direct collected liquidto drain outlet(s) 63. Floors 57, 58, and 59 may be sloped in a similarmanner. The various drain outlets are fitted with drain couplings 62 or68 to facilitate connection to suitable drain plumbing (not shown).

In the preferred embodiment as shown, a plurality of actuator shafthousings 69 including shaft bores 70 are positioned in inner exhaustplenum 29. These essentially subdivide inner exhaust plenum 29 intothree sub-plenums. To facilitate uniform exhaust flow through theentirety of exhaust plenum, it is therefore desirable to provide one ormore exhaust ports in each of such sub-plenums. Shaft housings 69 andbores 70 provide access for actuator shafts 314 to be coupled to andthereby control movement of inner baffle member 174 that operationallyengages inner exhaust plenum 29. In similar fashion, actuator shafthousings 73 including shaft bores 72 are positioned in middle exhaustplenum 30 and provide access for actuator shafts (not shown) to becoupled to and thereby control movement of middle baffle member 218 thatoperationally engages middle exhaust plenum 30. Also in similar fashion,actuator shaft housings 75 including shaft bores 76 are positioned inouter exhaust plenum 31 and provide access for actuator shafts 326 to becoupled to and thereby control movement of outer baffle member 262 thatoperationally engages outer exhaust plenum 31.

The central area of base pan 16 includes central through bore 78.Central through bore 78 preferably is generally circular incross-section as shown but could also be provided with other geometriesas desired. Cylindrical inner flange 80 projects upward from base pan 16and helps to define cylindrical inner sidewall 82 and outer sidewall 84.Outer sidewall 84 includes shoulder 90 at its top rim, and innersidewall 82 includes a shoulder 92 at its lower rim.

Inside processing chamber 503, workpiece 12 is supported and held bychuck 94. Chuck 94 is generally cylindrical in shape and includes anupper face 96, lower face 98, annular base 100, central through bore102, sidewall 104 at the outer periphery, and annular splash shield 108.Chuck 94 may be stationary or it may be rotatable about a central axis106. For purposes of illustration, the figures illustrate an embodimentof tool 10 in which chuck 94 is rotatably driven by motor 110 so thatworkpiece 12 may be spun about axis 106 during a treatment. In thoseembodiments in which workpiece 12 is spun by a rotating chuck 94, thespinning helps to spread dispensed treatment materials uniformly overthe workpiece 12. Motor 110 may be of the hollow shaft type havingcentral bore 112 and is mounted to tool 10 by any convenient approachsuch as by mounting structures 114.

Annular splash shield 108 extends downward from lower face 98 of chuck94. Lower end 109 of shield 108 is nested in shoulder 90 of inner flange80 and helps to prevent liquids from splashing over inner flange 80 andthen into central through bore 78. In embodiments in which chuck 94 isrotatable, there is a gap between shield 108 and the walls of shoulder90 to avoid having the shield 108 and shoulder walls rub against eachother, which could generate undesirable debris as the chuck 94 rotates.

Chuck 94 may secure workpiece 12 in any of a variety of different waysin accordance with conventional practices now or hereafter developed.Preferably, chuck 94 includes edge gripping structures (not shown) thatsecurely hold workpiece 12 above upper face 96 of chuck 94 such thatthere is a gap between workpiece 12 and the upper face 96. Thus,treatment chemicals, including rinse water, may be dispensed onto eitherupper face 128 or lower face 130 of workpiece 12.

Optionally, tool 10 may include dispense structure(s) for treating thelower face 130 of workpiece 12. An illustrative backside dispensemechanism is shown as a generally circular dispense head 136 in whichone or more treatment chemicals may be dispensed toward lower face 130of workpiece 12 through a plurality of nozzle orifices (not shown).Treatment chemicals are supplied to backside dispense head 136 via shaft138 that passes through central bore 102 of chuck 94 and central bore112 of motor 110. In embodiments in which chuck 94 rotates, there aregaps in between shaft 138, and central bores 102 and 112 so that theparts do not rub as the chuck 94 rotates. The backside dispense head 136may be coupled to one or more supplies (not shown) of treatmentmaterials to be dispensed as supplied or blended on demand.

Annular drip ring 156 is fitted to base pan 16 proximal to inner flange80. Drip ring 156 generally includes floor 158, inner wall 160, middlewall 162, curved top rim 164, and outer wall 166. Floor 158 cantsdownward to generally match the slope of and fit against floor 56 indrain basin 52. Inner wall 160 of drip ring 156 is fitted against lowersidewall portion 86 of inner flange 80. Middle wall 162 jogs outward sothat there is a gap between middle wall 162 and the sidewall 104 ofchuck 94. Curved top rim 164 provides a smooth transition between middlewall 162 and outer wall 166. This helps promote a smooth flow when anexhaust stream flows over drip ring 156 and into one or more open ductsto be described further below. Curved top rim 164 in this embodimentprojects slightly above the upper face 96 of chuck 94. In this way, someliquid spun outward from chuck 94 and/or workpiece 12 is caught in catchbasin 170 formed by drip ring 156. Drain ports 172 are provided in thelower portion of drip ring 156 formed by floor 158 and middle wall 162to allow liquid collected in catch basin 170 to drain into drain basin52.

Tool 10 further includes a plurality of moveable and nestable bafflemembers 174, 218, and 262 generally corresponding to the number ofexhaust plenums 29, 30, and 31 in this particular preferred embodiment.The baffle members 174, 218, and 262 advantageously can be movedindependently relative to each other to selectively and controllablyopen and/or choke one or more exhaust ducts into which exhaust streamsmay flow radially outward from workpiece 12 and/or chuck 94. The bafflemembers 174, 218, and 262 further define at least a portion of theboundaries of such one or more exhaust ducts and thus help guide exhauststreams flowing through the duct(s). The ability of the baffle members174, 218, and 262 to both move and nest together as desired allows tool10 to be more compact in that the portions of multiple ducts whoseboundaries are at least in part defined by these baffle members canoccupy very nearly the same volume in space as only a single duct.Compactness is important for a variety of reasons, including lowerrequired stack height, easier packaging, lesser tool dimensions, and thelike.

Inner baffle member 174 generally includes annular baffle plate 176 andannular baffle hood 194. Although plate 176 and hood 194 can be formedas a single, unitary part, it is preferred that these be separate partsthat are fastened or otherwise secured together to ease assembly,maintenance, and service of tool 10. Annular baffle plate 176 has uppersurface 178, lower surface 180, inner rim 182 proximal to the outerperiphery of chuck 94, outer sidewall flange 186, and inner sidewallflange 190. The surfaces among the components of annular baffle plate176 are connected by smooth transitions to promote smooth exhaust flowsover and/or under inner baffle member 174. The double wall structureprovided by outer sidewall flange 186 and inner sidewall flange 190provides multiple functions. As one function, these flanges 186 and 190provide a secure, rigid way to secure annular baffle plate 176 tocorresponding annular baffle hood 194. For any of the baffle members174, 218, or 262, the respective baffle plate may be attached to thecorresponding hood in any desired manner. Preferred approaches arenon-permanent so that the parts can be easily separated and replacedafter service and maintenance. Using both flanges 186 and 190 also makesit easier to define smooth flow pathways both above and below innerbaffle member 174, as desired.

Annular baffle hood 194 fits over and enshrouds exhaust inlet 35 ofexhaust plenum 29. Inner baffle member 174 is translatable up and downso that corresponding movement of hood 194 up and down opens and chokes,to the desired degree, the exhaust inlet 35. Additionally, hood 194includes structure that helps provide drain trap functionality in drainbasin 52. This helps to separate liquid and gas constituents of exhauststreams that flow through drain basin 52. Such separated constituentsmay be independently recovered for disposal, recycling, furtherreaction, or other handling as desired. As an additional function, hood194 helps to fluidly couple exhaust plenum 29 with a portion of the ductpathway whose boundaries are further defined at least in part by thelower surface 180 of annular baffle plate 176.

In more detail, annular baffle hood 194 includes cap plate 196, innerflange 198, outer flange 206, lower end 202, and inner surface 204. Capplate 196 is generally positioned over exhaust inlet 35 and helps todefine a headspace 208 over exhaust inlet 35. As inner baffle member 174is lowered, the volume of headspace 208 is reduced as cap plateapproaches and thereby chokes flow entering exhaust inlet 35. Innerbaffle member 174 desirably can be lowered far enough so that cap plate196 seats against and closes exhaust inlet 35. As inner baffle member174 is raised, the volume of headspace 208 over exhaust inlet 35 isincreased as cap plate 196 moves away from and thereby increases flowaccess to exhaust inlet 35.

Inner flange 198 is spaced apart from annular wall 22 to provide a flowchannel 200 fluidly coupling drain basin 52 to headspace 208. The lowerend of inner flange 198 extends below rims 33 and 34 that help defineexhaust inlet 35 to exhaust plenum 29. In this way, inner flange 198forms a barrier that blocks exhaust streams that enter the drain basin52 from flowing directly into exhaust plenum 29. Instead, such a streammust flow downward toward floor 56, around the lower end of inner flange198, and then upward through the flow channel 200 before gaining accessto exhaust inlet 35 via headspace 208. Thus, the positioning andconfiguration of inner flange 198 helps provide trap functionalitywithin drain basin 52. Liquid constituents in an exhaust stream flowingthrough drain basin 52 will have a relatively greater tendency tocollect within drain basin 52, while gaseous constituents will have arelatively greater tendency to flow through drain basin 52 and intoexhaust plenum 29.

To help promote this trap functionality, the inner surface of innerflange 198 is provided with surface features that help promotecondensation or other collection of liquid upon the inner surface. Theliquid collected in this way then drips or otherwise flows downward tofloor 56, where the liquid can be recovered via drain port(s) 63 forfurther handling. Preferred surface features as shown include an arrayof triangular protuberances 210. Each triangular protuberance 210 isoriented so that its apex 212 is upward (facing the incoming exhaustflow) while the base 214 is downward (away from the incoming flow). Therelatively sharp apex 212 confronting the incoming exhaust flow isbelieved to enhance liquid collection. Generally, using a greater numberof these protuberances 210 is desired to facilitate liquid trapping.However, the density of these features on the inner flange 198 is suchthat the bases 214 of the triangular protuberances 210 are spaced apartsufficiently so that liquid collected on the sides of the protuberancescan readily drip or flow downward to floor 56.

Outer flange 206 extends downward and is sufficiently close to annularwall 23 to substantially prevent exhaust from flowing between outerflange 206 and annular wall 23. To minimize the risk of generatingdebris due to rubbing contact, there preferably is a small gap betweenannular wall 23 and outer flange 206. When an exhaust is being pulledthrough exhaust plenum 29, this close gap spacing provides asufficiently high resistance to flow such that substantially all theexhaust will be pulled through plenum 29.

Middle baffle member 218 is similar to inner baffle member 174 andincludes annular baffle plate 220 and annular baffle hood 238. Annularbaffle plate 220 includes upper surface 222, lower surface 224, innerrim 226, outer flange 230, and inner flange 234. Annular baffle hood 238includes cap plate 240 helping to define headspace 252, inner flange 242helping to define a flow path through flow channel 244 and having lowerend 246 and inner surface 248, outer flange 250, and triangularprotuberances 254 having apexes 256 and bases 258. Hood 238 of middlebaffle member 218 operationally enshrouds middle exhaust plenum 30 andhelps to provide trap functionality within middle drain basin 53.Additionally, inner baffle member 174 and/or middle baffle member 218are moveable so that inner baffle member 174 may nest within middlebaffle member 218 and thereby variably choke, shut off, or otherwiserestrict the flow of a material between the two. Alternatively, the twobaffle members 174 and 218 can be separated to variably open a flow pathbetween the two.

Outer baffle member 262 is similar to inner baffle member 174 and middlebaffle member 218 and includes annular baffle plate 264 and annularbaffle hood 282. Annular baffle plate 264 includes upper surface 266,lower surface 268, inner rim 270, outer flange 274, and inner flange278. Annular baffle hood 282 includes cap plate 284 helping to defineheadspace 296, inner flange 286 helping to define a flow channel 288 andhaving lower end 290 and inner surface 292, outer flange 294, andtriangular protuberances 298 having apexes 300 and bases 302. Hood 282of outer baffle member 262 operationally enshrouds outer exhaust plenum31 and helps to provide trap functionality within outer drain basin 54.Additionally, outer baffle member 262 is moveable relative to innerbaffle member 174 and/or middle baffle member 218 so that middle bafflemember 218 may nest within outer baffle member 262 and thereby variablychoke, shut off, or otherwise restrict the flow of a material betweenthe two. Alternatively, the two baffle members 218 and 262 can beseparated to variably open a flow path between the two.

Tool 10 includes actuating mechanism(s) that independently actuate oneor more of baffle members 174, 218, and/or 262 to allow these barriersto be controllably and variably moved and nested relative to each other.Preferred actuating mechanisms for moving baffle members 174 and 262 areshown in the Figures. The actuating mechanisms for middle baffle member218 would be similar. With respect to inner baffle member 174, innerbaffle actuating motors 312 (motors 318 are used for middle bafflemember 218) are coupled to corresponding shafts 314 at one end and innerbaffle member 174 at the other. The shafts 314 are housed and move upand down within bores 70 of housings 69. Seals 316 help prevent leakingat these egress areas. Thus, inner baffle member 174 may be movedindependently relative to the middle baffle member 218 and outer bafflemember 262.

In similar fashion, outer baffle actuating motors 324 are coupled tocorresponding shafts 326 at one end and baffle member 262 at the other.The shafts 326 are housed and move up and down within bores 76 ofhousings 75. Seals 328 help prevent leaking at these egress areas. Thus,outer baffle member 262 may be moved independently relative to the innerbaffle member 174 and middle baffle member 218.

The baffle members 174, 218, and 262 are features of a compact andcontrollable multi-duct system that can be used to collect and exhausttreatment fluids from processing chamber 503. One or more of the ductsof the system can be variably opened and/or choked at any one time. Inthe preferred embodiment depicted in the Figures, each exhaust duct isindependent of and discrete from the others. This allows differentexhaust protocols to be used with streams exhausted through thedifferent ducts. Also, different treatment materials can be collected indifferent ducts to facilitate recycling without unduecross-contamination that might otherwise occur if a recycled treatmentmaterial were to be recovered from a duct used with other materials. Ina typical treatment, one or more kinds of treatment fluids are dispensedonto one or both surfaces of workpiece 12. When chuck 94, and henceworkpiece 12 rotate, the treatment chemicals tend to flow radiallyoutward and into the appropriate, open exhaust duct(s). Desirably, anexhaust can be pulled through the open duct(s) to help pull materialsinto the duct(s). Pulling such an exhaust also helps control particlesand fumes. A minimal amount of exhaust may be applied to the closedducts to help prevent cross-contamination. In those embodiments in whichthe chuck 94, and hence workpiece 12, are stationary, pulling an exhausthelps to draw the treatment materials radially outward and into theappropriate exhaust duct(s).

It can be appreciated, therefore, that tool 10 has many possible exhaustconfigurations. For purposes of illustration, FIGS. 2 through 7 showfour representative exhaust configurations that show the versatility oftool 10. FIGS. 2 and 3 show tool 10 in an exhaust configuration in whichan inner duct pathway 330 is open. In this configuration, all three ofbaffle members 174, 218, and 262 are raised and nested together. Thischokes flow between the members but opens annular duct inlet 332 to ductpathway 330 below inner baffle member 174. The baffle plates 176, 220,and 264 may be physically touching to choke off flow between the plates,but this can create an undue risk that particles could be generated.Accordingly, it is preferred that the plates 176, 220, and 264 do notphysically touch, but nonetheless are sufficiently close enough tocreate enough flow resistance that substantially the entirety of theexhaust stream flows into the open duct pathway 330.

The annular duct inlet 332 surrounds the outer peripheries of workpiece12 and chuck 94. The duct pathway 330 extends radially outward from ductinlet 332 a short distance. Duct pathway 330 then transitions downwardto include a more axially oriented flow channel between inner bafflemember 174 and outer wall 166 of drip ring 156. This extends ductpathway 330 into drain basin 52. The duct pathway 330 continues underhood 194 through flow channel 200, into headspace 208, into exhaustplenum 29 via exhaust inlet 35, and then out through outlet port 36 intosuitable plumbing such as inner exhaust manifold 336.

FIG. 4 shows an alternative exhaust configuration of tool 10 in which amiddle duct pathway 338 is open. In this configuration, inner bafflemember 174 is lowered sufficiently so that flow into the inner ductpathway 330 is choked off. Inner baffle member 174 may physicallycontact curved top rim 164 of annular drip ring 156, but it is morepreferred that these parts do not touch but are close enough together tochoke the flow. At the same time, cap plate 196 seats against and chokesexhaust inlet 35 into inner exhaust plenum 29. In the meantime, bothmiddle baffle member 218 and outer baffle member 262 are raised withmiddle baffle member 218 being nested within outer baffle member 262.This chokes flow between the members but opens annular duct inlet 340 tomiddle duct pathway 338 above inner baffle member 174 but below middlebaffle member 218.

The annular duct inlet 340 surrounds the outer peripheries of workpiece12 and chuck 94. The duct pathway 338 extends radially outward from ductinlet 340 a short distance. Duct pathway 338 then transitions downwardto include a more axially oriented flow channel between middle bafflemember 218 and inner baffle member 174. This extends duct pathway 338into drain basin 53. The duct pathway 338 continues under hood 238through flow channel 244, into headspace 252, into exhaust plenum 30 viaexhaust inlet 40, and then out through outlet port (not shown) intosuitable plumbing such as middle exhaust manifold 344.

FIG. 5 shows an alternative exhaust configuration of tool 10 in which anouter duct pathway 346 is open. In this configuration, inner bafflemember 174 and middle baffle member 218 are lowered and nested so thatplates 176 and 220 are close enough to choke off flow into the inner andmiddle duct pathways 330 and 338. At the same time, cap plate 196 seatsagainst and closes exhaust inlet 35 into inner exhaust plenum 29, andcap plate 240 seats against and closes exhaust inlet 40 into middleexhaust plenum 30. In the meantime, outer baffle member 262 is raised tothereby open annular duct inlet 348 to outer duct pathway 346 abovemiddle baffle member 218 but below outer baffle member 262.

The annular duct inlet 348 surrounds the outer peripheries of workpiece12 and chuck 94. The duct pathway 346 extends radially outward from ductinlet 348 a short distance. Duct pathway 346 then transitions downwardto include a more axially oriented flow channel between outer bafflemember 262 and middle baffle member 218. This extends duct pathway 346into drain basin 54. The duct pathway 346 continues under hood 282through flow channel 288, into headspace 296, into exhaust plenum 31 viaexhaust inlet 45, and then out through outlet port 46 into suitableplumbing such as outer exhaust manifold 352.

FIGS. 6 and 7 show an alternative exhaust configuration of tool 10 inwhich duct pathways 330, 338, and 346 are all closed and workpiece 12may be loaded into and/or taken from processing chamber 503. In thisconfiguration, inner baffle member 174, middle baffle member 218, andouter baffle member 262 are lowered and nested so that plates 176, 220,and 264 are close enough to choke off flow into the inner, middle, andouter duct pathways 330, 338, and 346. At the same time, cap plate 196seats against and closes exhaust inlet 35 into inner exhaust plenum 29,cap plate 240 seats against and closes exhaust inlet 40 into middleexhaust plenum 30, and cap plate 284 seats against and closes exhaustinlet 45 into outer exhaust plenum 31. Optionally, barrier plate 556 maybe raised to ease access to and from processing chamber 503.

The figures show an illustrative embodiment of one kind of preferredbarrier/dispense section 500 useful in dispensing one or more processingmaterials in the course of processing one or more microelectronicworkpieces. The dispense mechanism may be coupled to one or moresupplies (not shown) of treatment materials provided via supply lines(not shown). These materials can be dispensed as supplied or blended ondemand. A wide variety of treatment materials may be used, as tool 10 isquite flexible in the types of treatments that may be carried out. Justa small sampling of representative treatment materials include gases andliquids such as nitrogen, carbon dioxide, clean dry air, argon, HF gas,aqueous HF, aqueous isopropyl alcohol, deionized water, aqueous ammonia,aqueous sulfuric acid, aqueous nitric acid, hydrogen peroxide, ozonegas, aqueous ozone, organic acids and solvents, combinations of theseand the like. Additional representative examples of processes andchemistries suitably practiced in tool 10 include those described inapplication entitled APPARATUS AND METHOD FOR SPIN DRYING AMICROELECTRONIC SUBSTRATE, naming Tracy Gast as one of the inventors,the disclosure of which is fully incorporated herein by reference.

Barrier/dispense section 500 includes as major components ceiling plate504, moveable support member 526, dispense assembly 554, and optionalbut preferred shutter 818. Electric, pneumatic, or other suitableactuators (not shown) can be utilized to effect the desired motion ofthese components. Ceiling plate 504 forms a barrier that helps to definea first zone 506 above ceiling plate 504 and a second zone 508 belowceiling plate 504. Second zone 508 generally includes headspace 502,which is generally the volume of second zone 508 above annular body 558,and processing chamber 503, which is generally the volume of second zone508 below annular body 558. The dimensions of headspace 502 andprocessing chamber 503 correspondingly change with movement of dispenseassembly 554 in z-axis 527.

Ceiling plate 504 includes panel 510 having an outer periphery 512 andan inner periphery 514 defining a generally central through aperture516. This aperture 516 may have any desired shape, but preferably iscircular as shown. Outer wall 515 extends upward from panel 510 toessentially form a wall around panel 510. Wall 515 enhances the rigidityof ceiling plate 504, helps to capture leaks from dispensing components,and provides convenient surfaces by which to mount ceiling plate 504 toits framework/housing. Cylindrical center wall 518 extends upward frompanel 510 and has top rim 520 and base 522. Base 522 is attached topanel 510 proximal to aperture 516. Thus, cylindrical wall 518 providesa pathway 524 extending from top rim 520 to base 522 that providesegress between first zone 506 and second zone 508. As described furtherbelow, this pathway 524 also helps to house a portion of shutter 818 aswell as a portion of the moveable support member 526 which is used toraise and lower the dispense assembly 554 to desired positions. In thepreferred embodiment shown, moveable support member 526 and shutter 818are co-axially nested within this pathway 524.

Moveable support member 526 includes inner wall 528 having top rim 530and bottom rim 532. Outer wall 534 is generally concentric with innerwall 528 and extends from top rim 536 to bottom rim 538. Annular plate540 couples top rim 530 of inner wall 528 to top rim 536 of outer wall534, thus forming an annular chamber 542 between walls 528 and 534.Outer annular flange 546 extends outward from generally the bottom rimof outer wall 534, and inner annular flange 548 extends inward generallyfrom bottom rim 532 of inner wall 528. The annular flanges 546 and 548help to stiffen moveable support member 526. Annular flange 548 alsoprovides a convenient surface for mounting dispense assembly 554 to thelower end of moveable support member 526 via mounting holes 549.Actuating mechanisms (not shown) that cause moveable support member 526to move through a range of motion in the z-axis 527 may be convenientlycoupled to outer annular flange 546.

Inner wall 528 of moveable support member 526 helps to define a conduit544 that is open from rim 530 to bottom rim 532. This conduit 544provides a convenient, protected pathway for leading plumbing and othercomponentry from first zone 506 to the dispense assembly 554 mounted atthe lower end of moveable support member 526.

Moveable support member 526 is moveable in a z-axis 527 relative to theworkpiece 12. Because dispense assembly 554 is mounted to the lower endof moveable support member 526, movement of moveable support member 526along the z-axis 527 raises and lowers dispense assembly 554 relative toworkpiece 12 as well.

Moveable support member 526 is positioned so that inner wall 528 ishoused inside pathway 524. Outer wall 534, on the other hand, is outsideof pathway 524 so that wall 518 remains nested inside annular chamber542. There are small, annular gaps between walls 518, 528, and 534 sothat these walls do not touch during z-axis movement of moveable supportmember 526. These gaps reduce the risk of contamination from debris thatmight otherwise be generated from contacting surfaces during the courseof a treatment. During the course of a treatment, it also may bedesirable to maintain the first zone 506 at a slight negative pressurerelative to second zone 508. This would help prevent contamination frompassing from first zone 506 through the annular gaps between the ceilingplate 504 and the moveable support member 526 down into the processingchamber 503 area of second zone 508. As another feature that helpsminimize contamination from first zone 506 from compromising theenvironment within second zone 508, outer wall 534 of moveable supportmember 526 also functions in part as a baffle to help block directaccess from first zone 506 into the annular gap between inner wall 528and center wall 518. The manner in which center wall 518 is nestedinside annular chambers 542 and 836 also helps to provide a labyrinthseal between center wall 518 and moveable support member 526 and shutter818 to further protect the integrity of the environment within secondzone 508.

Dispense assembly 554 is mounted to the lower end of moveable supportmember 526 and generally includes one or more independent mechanisms fordispensing treatment materials into the processing chamber 503. Forinstance, the illustrative embodiment of dispense assembly 554 includesat least one, preferably at least two, and more preferably at leastthree different kinds of dispensing capabilities. As one capability,these mechanisms include one or more dispensing structures that allowassembly 554 to spray one or more treatment fluids downward towardworkpiece 12. In preferred embodiments, this capability is provided by adispensing structure such as spray nozzle/barrier structure 556 thatintegrally incorporates independent first and second spray barfunctionalities. These independent spraying functionalities allow twoindependent treatment materials to be sprayed onto workpiece 12 at thesame time. Of course, other embodiments may include only a single spraysystem or three or more spray systems, as desired.

Additionally with respect to this particular embodiment, the generallyannular body 558 of the spray nozzle/barrier structure 556 functions inone respect as a lid over processing chamber 503 in order to helpprovide a protected environment for workpiece treatment. However, thegenerally annular body 558 preferably does not seal processing chamber503, but rather comes into close proximity with baffle members 174, 218,and 262 to produce a high restriction to air flow. When tool 10 isplaced into a wafer transfer configuration (described further below),the generally annular body 558 and baffle members 174, 218, and 262 areseparated by movement of one or more of these components to allowworkpiece 12 to be placed into and taken from processing chamber 503.

In more detail, spray nozzle/barrier structure 556 includes an annularbody 558 having a lower surface 560, top surface 562, inner periphery564 defining a generally central aperture 575, and outer periphery 566.The inner periphery 564 is rounded to help promote smooth gas flowthrough central aperture 575. Annular lip 568 extends generally radiallyoutward from outer periphery 566 preferably in a manner so that lip 568is generally aligned with top surface 562. Lip 568 and outer periphery566 form a annular gap 572. Via z-axis movement of moveable supportmember 526 to which annular body 558 is mounted, annular body 558 may bepositioned so that the ends 182, 226, and/or 270 of one or more ofbaffle members 174, 218 and/or 262 may fit into annular gap 572.Preferably, a small gap is maintained in annular gap 572 to avoidcontact between baffles and annular body 558. This helps to prevent flowof materials from headspace 502 into the process chamber 503. Threadedbores 574 facilitate mounting annular body 558, and hence dispenseassembly 554, to the inner annular flange 548 of moveable support member526 using screws 846, or the like, fitted through mounting holes 549.

Preferably, at least lower surface 560 of annular body 558 is canteddownward in a radially outward direction relative to workpiece 12 toestablish a tapering flow channel 576 between workpiece 12 and annularbody 558. The canted surface 560 can have a variety of geometries. Forinstance, its geometry can be one or more of conical, parabolic,polynomial, or the like. For purposes of illustration, annular body 558has a hollow, frustoconical geometry that is truncated at innerperiphery 564 so as to provide generally central aperture 575. Theresultant tapering flow channel helps to promote radial flow outwardfrom center of workpiece 12 while minimizing recirculation zones. Thetaper also helps to smoothly converge and increase the velocity offlowing fluids approaching the outer edge of the workpiece 12. Thishelps to reduce liquid splash effects. The angle of lower surface 560also helps liquid to drain from or drip off of the outer periphery 566of annular body 558 rather than drain or drip straight down onto theunderlying workpiece 12.

Arm structure 578 of spray nozzle/barrier structure 556 extendsgenerally across central aperture 575 and is coupled to inner periphery564 of annular body 558 at junctures 580 and 582. Arm structure 578includes first and second sub-arm portions 584 and 586. Arm structure578 includes aperture 589 for mounting central dispense nozzle member754. In the preferred embodiment shown, first sub-arm portion 584 isgenerally aligned with an adjacent portion 590 of annular body 558,while second sub-arm portion 586 is generally aligned with an adjacentportion 592 of annular body 558. In particular, the bottom surfaces 598and 608 of sub-arms 584 and 586 are aligned with lower surface 560 ofannular body 558. Thus, sub-arms 584 and 586 generally meet at anoblique angle. Arm structure 578 subdivides central aperture 575 intofirst and second aperture portions 594 and 596. These aperture portions594 and 596 may function as air intake ports with respect to processingchamber 503 during a treatment. The edges of the adjacent arm structure578 are desirably rounded to promote smooth, uniform flow through theseintake ports.

A first generally triangular groove 600 is formed on the underside ofspray nozzle/barrier structure 556. This groove 600 spans at least aportion of a first radius of spray nozzle/barrier structure 556 thatextends along portions of first sub-arm portion 584 and the adjacentportion 590 of annular body 558. This groove 600 includes an apex region602 extending along the length of groove 600 and adjacent faces 604 and606. In a similar fashion, a second generally triangular groove 610 isformed on the underside of spray nozzle/barrier structure 556. Thisgroove 610 spans at least a portion of a second radius of spraynozzle/barrier structure 556 that extends along portions of secondsub-arm portion 586 and the adjacent portion 592 of annular body 558.Like groove 600, this groove 610 includes an apex region (not shown)extending along the length of groove 610 and adjacent faces (not shown).

The grooves 600 and 610 independently include nozzle features that allowseparate streams of treatment materials to be dispensed from one or morerespective nozzles or nozzle arrays (described further below)incorporated into the grooves. These nozzles generally dispensetreatment material(s) downward toward workpiece 12, with the nozzle(s)associated with each groove providing coverage with respect to arespective radius of the workpiece 12 for excellent cleaning efficiency.In the preferred embodiment as shown, the grooves 600 and 610 span firstand second radii of spray nozzle/barrier structure 556 and are generallyopposed with respect to each other. Thus, together, the two groovessubstantially span the full diameter of the workpiece 12.

Spray nozzle/barrier structure 556 includes several features in order toincorporate a first, independent spray bar capability into sub-armportion 584 and the adjacent portion 590 of annular body 558. Thesefeatures generally include fluid inlet member 622 having threaded base624 and flare coupling 626. A supply tube 854 is fluidly coupled toflare coupling 626 and held in place via flare nut 856 that threadablyengages threaded base 624. Conduit 628 extends from inlet port 630 toflow channel 632 extending generally radially outward through sub-armportion 584 and a portion of the adjacent portion 590 of annular body558. Branch conduits 636 extend from flow channel 632 outward to anarray of respective nozzles 638 distributed along apex region 602.Preferably, the array of nozzles 638 is linear, although other arraypatterns may be used if desired. It is also preferred that the array ofnozzles 638 spans at least a portion and more preferably at leastsubstantially all of a radius of the underlying workpiece 12.

In use, material to be dispensed via nozzles 638 is fed through supplytube 854 into inlet port 630. From inlet port 630, the material flowsthrough conduit 628 and then through flow channel 632. From flow channel632, the material is distributed among the branch conduits 636 leadingto nozzles 638, and then is dispensed from the array of nozzles 638.

Sub-arm portion 584 further incorporates fluid inlet member 642 havingthreaded base 644 and flare coupling 646. A supply tube 850 is fluidlycoupled to flare coupling 646 and held in pace via flare nut 852 thatthreadably engages threaded base 644. An inlet conduit 648 extends frominlet port 650 to bifurcation 652, where the flow channel then splitsinto conduits 654 and 656. Conduits 654 and 656 extend from bifurcation652 to respective flow channels 658 and 660. Each of flow channels 658and 660 extend generally radially outward through sub-arm portion 584and the adjacent portion 590 of annular body 558. A plurality of branchconduits (not shown) extend from flow channel 658 outward to an array ofrespective nozzles 664 distributed along face 604 of groove 600, whilebranch conduits (not shown) extend from flow channel 660 outward to anarray of respective nozzles 665 distributed along face 606 of groove600. Preferably, each of the arrays of nozzles 664 and 665 is linear andparallel to each other as well as to the array of nozzles 638, althoughother array patterns may be used if desired. It is also preferred thatthe arrays of nozzles 664 and 665 span at least a portion and morepreferably at least substantially all of a radius of the underlyingworkpiece 12.

Material to be dispensed via nozzles 664 and 665 is fed through supplytube 850 into inlet port 650. From inlet port 650, the material flowsthrough conduit 648. At bifurcation, the flow is distributed betweenconduits 654 and 656. The respective flows then flow through channels658 and 660. From flow channels 658 and 660, the respective flows ofmaterial are distributed among the branch conduits (not shown) and arethen dispensed from the arrays of nozzles 664 and 665.

Conduit 628, flow channel 632, and branch conduits 636 are convenientlyformed using any desired boring techniques. For instance, flow channels632, 658, and 660 may be conveniently formed by boring correspondingholes in a direction from the outer periphery 566 of annular body 558radially inward. After boring the holes to provide flow channels 632,658, and 660, plugs 640 may be inserted to seal the ends of theresultant flow channels 632, 658, and 660.

The nozzles 638, 664, and 665 generally dispense fluid streams in aconverging fashion so that the dispensed streams atomizingly collidewith each other. Liquids, gases, or combinations of these may bedispensed using spray bar system 620. In one representative mode ofoperation a liquid material is fed through supply tube 850 andconsequently dispensed through nozzles 664 and 665, while a gaseousmaterial is fed through supply tube 854 and consequently dispensedthrough nozzles 638. The respective feeds can be supplied separately ortogether. When fed together, the dispensed gas stream will help to moreenergetically atomize the dispensed liquid streams.

The spacing, dispense trajectory with respect to the surface ofworkpiece 12, orifice size of the nozzles 638, 664, and 665, and thelike may be varied to adjust the spray characteristics of the dispensedstreams. For instance, to help create a more uniform spray across theradius of workpiece 12, the spacing of the nozzle orifices and nozzleorifice sizes may be varied.

Additional, independent spray bar functionality may also be incorporatedinto spray nozzle/barrier structure 556. As shown, this additional sprayfunctionality is generally identical to that of the first spray barfunctionality already described, except for being integrated into secondsub-arm portion 586 and the adjacent portion 592 of annular body andextending along a second radius of spray nozzle/barrier structure 556.The features providing this second spray bar functionality include firstfluid inlet member 668 having threaded base 670 and flare coupling 672,and second fluid inlet member 674 having threaded base 676 and flarecoupling 678. A supply tube 862 is fluidly coupled to flare coupling 672and held in place by flare nut 864 that threadably engages threaded base670. Materials fed through supply tube 862 are dispensed through anarray of nozzles (not shown) along an apex of grove 610 that are similarto the array of nozzles 638 along apex 602. These materials are conveyedthrough conduits (not shown) that are similar to conduit 628, flowchannel 632, and branch conduits 636 of first integrated spray barsystem 620. Another supply tube 858 is fluidly coupled to flare coupling678 and held in place by flare nut 860 that threadably engages threadedbase 676. Materials fed through supply tube 858 are dispensed througharrays of nozzles (not shown) on faces of groove 610 that are similar toarrays of nozzles 664 and 665 on faces 604 and 606. These materials areconveyed through conduits (not shown) that are similar to inlet conduit648, bifurcation 652, conduits 654 and 656, flow channels 658 and 660,and branch conduits (not shown) used in first integrated spray barsystem 620.

At least the lower surface 560 of annular body 558 may be hydrophilic orhydrophobic, as desired, depending upon the nature of the treatment(s)that might be carried out using tool 10. More preferably, the entiretyof spray nozzle/barrier structure 556 may be formed from one or morematerials having the desired hydrophobic or hydrophilic character.

In addition to spraying capabilities, dispense assembly 554 furtherincorporates dispensing capabilities to dispense one or more treatmentfluids generally onto the center of the underlying workpiece 12. Thetreatment fluids may be dispensed serially, simultaneously, inoverlapping fashion, and/or the like. In preferred embodiments, thiscapability is provided by a dispensing structure such as centraldispense member 754. For purposes of illustration, central dispensemember 754 as shown includes two independent nozzles allowing twodifferent treatment materials to be dispensed onto workpiece 12 at thesame time. Of course, other embodiments may include only a singledispensing nozzle or three or more nozzles, as desired.

In more detail, central dispense member 754 generally includes body 756having top 758, sidewall 760, and bottom 762. First and second flarecouplings 764 and 766 project from top 758. First and second rims 768and 770 project from bottom 762. A first through conduit 772 extendsfrom first inlet port 774 to first outlet port 776, while a secondthrough conduit 778 extends from second inlet port 780 to second outletport 782.

A pin 786 having a threaded bore 788 is housed in conduit 790 extendingacross body 756. Pin 786 is inserted into body 756 so that threaded bore788 is generally aligned with conduit 791. Mounting screw 793 engagesthreaded bore 788 and is housed within conduit 791 to help mount centraldispense member 754 to dispense assembly 554. A pair of reliefs 792 and794 are formed in body 756 to prevent sprayed treatment fluids fromimpinging on central dispense member 754.

Supply tubes 866 and 868 are coupled to flare couplings 764 and 766using retainer/spacer clamp 796. In use, material to be dispensed fromcentral dispense member 754 is fed through one or both of supply tubes866 and 868 and into one or both of inlet ports 774 and 780, as the casemay be. From inlet ports 774 and/or 780, the material flows throughconduits 772 and/or 778. From conduits 772 and/or 778, the material isdispensed from the outlet ports 776 and/or 782 which constitute a pairof nozzles, towards the center of workpiece 12. Outlet ports 776 and/or782 can also be angled to help provide fuller coverage of the treatmentfluids on the center of workpiece 12.

In addition to spraying and central dispense capabilities, dispenseassembly 554 further incorporates still yet further dispensingcapabilities to dispense one or more treatment fluids showerhead-stylegenerally downward toward workpiece 12. This approach is especiallyuseful for dispensing uniform flows of one or more gases and/or vaporsinto processing chamber 503. In preferred embodiments, this capabilityis provided by a dispensing structure such as showerhead dispense member680. For purposes of illustration, showerhead dispense member 680 is fedby two supply feeds, which may be the same or independent, thus allowingtwo different treatment materials to be dispensed into processingchamber 503 at the same time. Of course, other embodiments may includeonly a single supply feed or three or more feeds, as desired.

In more detail, showerhead dispense member 680 generally includes base682 and cover 734. Base 682 includes generally circular floor 684 andrecessed subfloor 686. Walls 688 interconnect floor 684 and subfloor686. Subfloor 686 includes several aperture features that allow plumbingfeatures to be conveniently and compactly led to spray nozzle/barrierstructure 556 and central dispense nozzle member 754. In particular,apertures 690, 696, 702, and 708 fit over fluid inlet members 622, 642,668, and 674, respectively. Flare nuts 852, 856, 864, and 860, seatagainst shoulders 700, 694, 706, and 712, respectively, when mountingsupply tubes 850, 854, 862, and 858 to their respective flare couplings646, 626, 672, and 678. Optionally, a jam nut can be used to seatagainst shoulders 694, 700, 706 and 712 so flare nut does not have toperform dual functions. Similarly, apertures 714 and 716 provide accessfor coupling supply tubes 866 and 868 to their respective flarecouplings 764 and 766 on central dispense nozzle member 754.

Aperture 718 facilitates mounting of central dispense member 754 withinaperture 589 and to the underside of subfloor 686 using retainer/spacerclamp 796 and screw 793. Clamp 796 includes body 798 having sidewall800, top 802, and bottom 804. First and second conduits 806 and 808house and help maintain the alignment of supply tubes 866 and 868 thatare coupled to central dispense member 754. Conduit 810 houses screw 793used to clamp central dispense member 754 in position. Body 798 isrelieved on opposing sides so that clamp 796 nests between flare nuts856 and 864.

Floor 684 of base 682 includes first region 720 and second region 725positioned on opposing sides of subfloor 686. First region 720 includesan array of nozzles 722, while second region 725 includes a second arrayof nozzles 728.

Cover 734 generally includes raised central panel 736 stiffened byannular rim 738 and beams 739. First and second chambers 740 and 741 areformed between cover 734 and base 682. First chamber 740 is generallybetween cover 734 and nozzles 722, while second chamber 741 is generallybetween cover 734 and nozzles 728. As illustrated, first and secondchambers 740 and 741 are isolated from each other, but have a commonsupply source. If desired, independent supply sources may be used. Fluidinlet members 742 project upward from central panel 736. Fluid inletmembers 742 include threaded bases 744 and flare couplings 746. Supplytubes 747 are fluidly coupled to flare couplings 746 and held in placevia flare nuts 748 that threadably engage threaded bases 744. Conduits749 extend from inlet ports 750 to outlet ports 751, where conduits 749open into chambers 740 and 741.

Mounting holes 730 on outer periphery 732 of base 682 and mounting holes752 on cover 734 facilitate mounting showerhead dispense member 680 toannular body 558 using screws 846. Standoffs 844 help to maintain thedesired positioning of showerhead dispense member 680. Showerheaddispense member 680 is mounted to spray nozzle/barrier structure 556 ina manner so that nozzles 722 and 728 generally overlie aperturesub-sections 594 and 596.

In use, one or more treatment fluids, especially one or more flows ofgas(es), are supplied to showerhead dispense member 680 via one or bothof supply tubes 747. The treatment fluids supplied to each tube 747 maybe the same or different. The treatment fluids are introduced intochambers 740 and 741 via conduits 749. The pressure of the treatmentfluid(s) within chambers 740 and 741 is generally equalized so that theflow through the nozzles 722 and 728 is uniform. Desirably, the pressuredifferential of the fluid(s) within chambers 740 and 741 upstream fromthe showerhead nozzles is desirably less than pressure drop through thenozzles 722 and 728 themselves in accordance with conventional practicesto promote such uniform flow. When dispensed through the nozzles 722 and728, the dispensed fluid(s) generally flow towards workpiece 12 throughaperture sub-sections 594 and 596. An exhaust may be pulled through oneor more of plenums 29, 30, or 31 to facilitate this flow.

Shutter 818 is independently moveable in the z-axis 527 relative to theworkpiece 12 through a range of motion that includes the generally fullyopen position as shown in FIGS. 3 and 6 and the generally fully closedposition shown in FIG. 2. Desirably, shutter 818 can be positioned inintermediate locations between these two extremes in which shutter 818is partially opened/closed. In FIG. 2 in which shutter 818 is in aclosed position, moveable support member 526 is lowered into a treatmentposition at which baffle members 174, 218, and 262 are positioned withinannular gap 572 of annular body 558. This helps to protect the integrityof the environment within process chamber 503. In the meantime, shutter818 is raised so that its top portion is nested within annular chamber542 with annular plate 832 being positioned adjacent to annular plate540. A small gap, though, preferably is maintained between annularplates 832 and 540 to prevent contact that might otherwise generateundesired contamination. With the shutter 818 raised and open in thisfashion, one or more gases and/or vapors in headspace 502 are free to bedrawn into processing chamber 503 through air intake vents formed byaperture sub-sections 594 and 596. In short, FIG. 2 shows one embodimentof an illustrative configuration of tool 10 useful to carry outtreatment(s) with respect to workpiece 12.

In FIG. 6, moveable support member 526 (and hence dispense assembly 554)is raised away from baffle members 174, 218, and 262 to allow workpiece12 to be transferred to and from its position on supporting chuck 94 viaresultant gap 874. In short, FIG. 6 shows one embodiment of anillustrative configuration of tool 10 useful to accomplish workpiecetransfer to and from tool 10.

FIG. 2 shows an illustrative configuration of tool 10 in which shutter818 is in a closed position. The tool configuration of FIG. 2 is similarto that of FIG. 3 except that now shutter 818 is lowered relative tomoveable support member 526 so that bottom rim 824 is positioned inclose proximity to the top surface 562 of annular body 558. Desirably, asmall gap is maintained so that bottom rim 824 does not actually contacttop surface 562. In this configuration, shutter 818 helps to choke theair intake into processing chamber 503 from the volume of headspace 502external to shutter 818, while also helping to contain one or more gasesand/or vapors introduced to processing chamber 503 via dispense assembly554. For instance, the closed shutter 818 facilitates containing a “fog”of EPA-enriched gas/vapor mixture that might be dispensed towardworkpiece 12 via showerhead dispense member 680. As another example, theclosed shutter 818 also could help to contain fluids used to wash theunderside of spray nozzle/barrier structure 556. A suitable negativepressure maintained in headspace 502 relative to processing chamber 503can help to prevent contamination from entering process chamber 503.

In more detail, shutter 818 includes inner wall 820 having top rim 822and bottom rim 824. Outer wall 826 is generally concentric with innerwall 820 and extends from top rim 828 to bottom rim 830. Annular plate832 couples top rim 822 of inner wall 820 to top rim 828 of outer wall826, thus forming an annular chamber 836 between walls 820 and 826.Outer annular flange 838 extends outward from generally the bottom rim830 of outer wall 826 to help stiffen shutter 818. Annular flange 838also provides a convenient surface for mounting actuating structures(not shown) that help to move shutter 818 through a range of motion in az-axis 527 relative to the surface of workpiece 12.

Inner wall 820 of shutter 818 helps to define a conduit 834 that is openfrom top rim 822 to bottom rim 824. The inner wall 528 of moveablesupport member 526 is housed inside this conduit 834. A small annulargap separates inner wall 528 from inner wall 820 so that the parts donot contact each other when one or both are moved in the z-axis 527.

Shutter 818 is positioned so that outer wall 826 is outside of pathway524 so that wall 518 remains nested inside annular chamber 836. In turn,the top part of shutter 818 is nested inside of annular chamber 542 ofmoveable support member 526. Preferably, there are small, annular gapsbetween walls 528, 820, 518, 826, and 534 so that these walls do nottouch during z-axis movements of moveable support member 526 as anycontact between the wall surfaces could generate contamination.

Other embodiments of this invention will be apparent to those skilled inthe art upon consideration of this specification or from practice of theinvention disclosed herein. Various omissions, modifications, andchanges to the principles and embodiments described herein may be madeby one skilled in the art without departing from the true scope andspirit of the invention which is indicated by the following claims.

1. An apparatus for processing a microelectronic workpiece, comprisinga) a support on which the workpiece is positioned during a process; andb) a plurality of moveable and nestable baffle members defining at leastportions of a plurality of duct pathways having respective duct inletsproximal to an outer periphery of the workpiece, wherein at least onemoveable and nestable baffle member comprises a hood that fits over andenshrouds an entire inlet to a downstream duet portion in a manner suchthat the inlet to the downstream duct can be controllably opened andchoked by movement of the hood in a manner such that liquid can beseparated from an exhaust stream before the exhaust stream enters theinlet to the downstream duct portion.
 2. The apparatus of claim 1,wherein relative positioning of the baffle members with respect to eachother helps to selectively open and choke the duct pathways.
 3. Theapparatus of claim 2, wherein the baffle members are structured suchthat causing a first baffle member to be nested within a second bafflemember helps to choke a duct pathway having a duct pathway portionbetween the first and second baffle members.
 4. The apparatus of claim2, wherein the degree to which the duct pathways are opened and chokedcan be controlled.
 5. The apparatus of claim 1, wherein one or morefluids used to treat the workpiece is/are being collected in at leastone of the duct pathways.
 6. The apparatus of claim 1, wherein the ductpathways comprise respective duct portions that are positioned generallycoaxially relative to each other and with respect to the workpiece. 7.The apparatus of claim 1, wherein relative movement between at least twobaffle members helps to selectively open and/or choke at least an inletof one of the duet pathways, wherein said inlet is proximal to an outerperiphery of the workpiece.
 8. The apparatus of claim 1, whereinmovement of a baffle member helps to open and/or choke an inlet of acorresponding duet pathway and an additional portion of thecorresponding duct pathway that is downstream from said inlet.
 9. Theapparatus of claim 1, wherein the support is rotatable.
 10. Theapparatus of claim 1, wherein each duct pathway comprises a path portionproximal to an outer periphery of the workpiece having an orientationthat is generally parallel to a major face of the workpiece and anadditional duct path portion that is generally perpendicularly orientedwith respect to said major surface.
 11. The apparatus of claim 10,wherein the additional duet path portions comprise a plurality ofcoaxial plenums.
 12. The apparatus of claim 11, wherein said coaxialplenums are formed by fixed duct structures.
 13. The apparatus of claim10, wherein an additional duct path portion can be selectively openedand choked.
 14. The apparatus of claim 1, further comprising a drainbasin having one or more drain ports, wherein the drain basin isassociated with the at least one moveable and nestable baffle membersuch that the liquid that can be separated from the exhaust streambefore the exhaust stream enters the inlet to the downstream ductportion can enter the one or more drain ports after being separated fromthe exhaust stream.
 15. The apparatus of claim 1, wherein the moveableand nestable baffle members are fluidly coupled to fixed ductstructures.
 16. An apparatus for processing a microelectronic workpiece,comprising a) a support on which the workpiece is positioned during aprocess; and b) a plurality of moveable and nestable baffle membersdefining at least portions of a plurality of duct pathways havingrespective duct inlets proximal to an outer periphery of the workpiece,wherein at least one portion of at least one baffle member can moverelative to an inlet to a downstream duct portion in a manner so as tocreate a trap region where separation between a liquid material and gasmaterial occurs.
 17. The apparatus of claim 16, wherein each ductpathway comprises a path portion proximal to an outer periphery of theworkpiece having an orientation that is generally parallel to a majorface of the workpiece and an additional duct path portion that isgenerally perpendicularly oriented with respect to said major surface.18. The apparatus of claim 17, wherein the additional duct path portionscomprise a plurality of coaxial plenums.
 19. The apparatus of claim 18,wherein said coaxial plenums are formed by fixed duct structures. 20.The apparatus of claim 17, wherein an additional duct path portion canbe selectively opened and choked.
 21. The apparatus of claim 16, whereinthe trap region comprises one or more drain ports.
 22. The apparatus ofclaim 16, wherein the moveable and nestable baffle members are fluidlycoupled to fixed duct structures.
 23. An apparatus for processing amicroelectronic workpiece, comprising: a) a support on which theworkpiece is positioned during a process; and b) a plurality of moveableand nestable baffle members defining at least portions of a plurality ofduct pathways having respective duct inlets proximal to an outerperiphery of the workpiece, wherein at least one moveable and nestablebaffle member comprises a hood that enshrouds an inlet to a downstreamduct portion in a manner such that the inlet to the downstream duct canbe controllably opened and choked by movement of the hood in a mannersuch that liquid can be separated from an exhaust stream before theexhaust stream enters the inlet to the downstream duct portion, whereinthe hood comprises: i) a cap plate that fits over the entire inlet tothe downstream duct; ii) a first flange extending from one end of thecap plate to beyond the inlet to the downstream duct; and iii) a secondflange extending from the opposite end of the cap plate as the firstflange, and extending beyond the inlet to the downstream duct.
 24. Theapparatus of claim 23, wherein the hood is an annular hood and the inletto the downstream duct comprises: a) a first annular wall; and b) asecond annular wall spaced apart from the first annular wall in a mannerto define the duct, wherein the first flange is spaced apart from thefirst annular wall in a manner to provide a flow channel to the inlet tothe downstream duct, and wherein the second flange is spaced apart fromthe second annular wall in a manner to substantially prevent exhaustfrom flowing between the second flange and the second annular wall.